Your best bet would be the TR3685 which leaves Cambridge on Friday at 13:00 and gets to London Kings Cross at 13:51.
Perfect. Thank you for your help today.
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attraction-area attraction-type train-arriveby train-day train-departure train-destination
attraction-area attraction-name attraction-type train-arriveby train-day train-departure train-destination
attraction-area attraction-type train-arriveby train-day train-departure train-destination